shell_cmds-216.60.1.tar.gz

diff --git a/echo/echo.c b/echo/echo.c
index 6189420f6b62e70c49588d5da5ec590a506ab882..a994e6d10690c8adf3e1ed864dfa164b2892275a 100644 (file)
--- a/echo/echo.c
+++ b/echo/echo.c
@@ -47,9 +47,18 @@ __FBSDID("$FreeBSD: src/bin/echo/echo.c,v 1.18 2005/01/10 08:39:22 imp Exp $");
 #include <string.h>
 #include <wchar.h>
 
+static void
+flush_and_exit(void)
+{
+       if (fflush(stdout) != 0)
+               err(1, "fflush");
+       exit(0);
+}
+
 static char *
-print_one_char(char *cur, int *bytes_len_out)
+print_one_char(char *cur, int posix, int *bytes_len_out)
 {
+       char *next;
        wchar_t wc;
        int bytes_len = mbtowc(&wc, cur, MB_CUR_MAX);
        if (bytes_len <= 0) {
@@ -58,13 +67,26 @@ print_one_char(char *cur, int *bytes_len_out)
                goto out;
        }
 
+       /* If this is not an escape sequence, just print the character */
        if (wc != '\\') {
                putwchar(wc);
                goto out;
        }
 
-       cur += bytes_len;
-       bytes_len = 1;
+       next = cur + bytes_len;
+
+       if (!posix) {
+               /* In non-POSIX mode, the only valid escape sequence is \c */
+               if (*next == 'c') {
+                       flush_and_exit();
+               } else {
+                       putchar(wc);
+                       goto out;
+               }
+       } else {
+               cur = next;
+               bytes_len = 1;
+       }
 
        switch (*cur) {
                case 'a':
@@ -76,9 +98,7 @@ print_one_char(char *cur, int *bytes_len_out)
                        goto out;
 
                case 'c':
-                       if (fflush(stdout) != 0)
-                               err(1, "fflush");
-                       exit(0);
+                       flush_and_exit();
 
                case 'f':
                        putchar('\f');
@@ -146,7 +166,7 @@ main(int argc, char *argv[])
                        int bytes_len = 0;
 
                        for (const char *end = cur + arg_len; cur < end; cur += bytes_len) {
-                               cur = print_one_char(cur, &bytes_len);
+                               cur = print_one_char(cur, posix, &bytes_len);
                        }
                }
                if (last_arg && !nflag)